Calendar door number 12

The question is:

What does Ms. Santa observe?

Latest submission time: Monday 14 December, 2015, 23:00 PM

Unfortunately, a solution for this question can no longer be submitted!

Answer
A) The reflector reflects the light only if it enters at an angle of exactly 90 degrees (perpendicular).

Correct answer Answer
B) The reflector reflects the incident light completely within a ±45-degree range around perpendicular.

Answer
C) The reflector reflects the incident light within a ±45-degree range around perpendicular, but perpendicular gets reflected strongest.

Answer
D) The reflector absorbs incident light and emits it in all directions.